1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 @test
26 @bug 7088419
27 @summary Ensure that the byte-at-a-time, byte array, and DirectByteBuffer
28 methods of CRC32 and Adler32 are consistent across a range of inputs.
29 */
30
31 import java.nio.ByteBuffer;
32 import java.util.zip.Adler32;
33 import java.util.zip.CRC32;
34 import java.util.zip.Checksum;
35
36 public class CRCandAdlerTest {
37
38 public static void main(String[] args) throws Exception {
39
40 byte[] b = initializedBytes(4096 * 4096);
41
42 {
43 CRC32 crc1 = new CRC32();
44 CRC32 crc2 = new CRC32();
45 CRC32 crc3 = new CRC32();
46 CRC32 crc4 = new CRC32();
47
48 crc1.update(b, 0, b.length);
49 updateSerial(crc2, b, 0, b.length);
50 updateDirect(crc3, b, 0, b.length);
51 updateSerialSlow(crc4, b, 0, b.length);
52
53 check(crc1, crc2);
54 check(crc3, crc4);
55 check(crc1, crc3);
56
57 crc1.update(17);
58 crc2.update(17);
59 crc3.update(17);
60 crc4.update(17);
61
62 crc1.update(b, 1, b.length-2);
63 updateSerial(crc2, b, 1, b.length-2);
64 updateDirect(crc3, b, 1, b.length-2);
65 updateSerialSlow(crc4, b, 1, b.length-2);
66
67 check(crc1, crc2);
68 check(crc3, crc4);
69 check(crc1, crc3);
70
71 report("finished huge crc", crc1, crc2, crc3, crc4);
72
73 for (int i = 0; i < 256; i++) {
74 for (int j = 0; j < 256; j += 1) {
75 crc1.update(b, i, j);
76 updateSerial(crc2, b, i, j);
77 updateDirect(crc3, b, i, j);
78 updateSerialSlow(crc4, b, i, j);
79
80 check(crc1, crc2);
81 check(crc3, crc4);
82 check(crc1, crc3);
83
84 }
85 }
86
87 report("finished small survey crc", crc1, crc2, crc3, crc4);
88 }
89
90 {
91 Adler32 crc1 = new Adler32();
92 Adler32 crc2 = new Adler32();
93 Adler32 crc3 = new Adler32();
94 Adler32 crc4 = new Adler32();
95 // Test long CRC.
96
97 crc1.update(b, 0, b.length);
98 updateSerial(crc2, b, 0, b.length);
99 updateDirect(crc3, b, 0, b.length);
100 updateSerialSlow(crc4, b, 0, b.length);
101
102 check(crc1, crc2);
103 check(crc3, crc4);
104 check(crc1, crc3);
105
106 crc1.update(17);
107 crc2.update(17);
108 crc3.update(17);
109 crc4.update(17);
110
111 crc1.update(b, 1, b.length-2);
112 updateSerial(crc2, b, 1, b.length-2);
113 updateDirect(crc3, b, 1, b.length-2);
114 updateSerialSlow(crc4, b, 1, b.length-2);
115
116 check(crc1, crc2);
117 check(crc3, crc4);
118 check(crc1, crc3);
119
120 report("finished huge adler32", crc1, crc2, crc3, crc4);
121
122 for (int i = 0; i < 256; i++) {
123 for (int j = 0; j < 256; j += 1) {
124 crc1.update(b, i, j);
125 updateSerial(crc2, b, i, j);
126 updateDirect(crc3, b, i, j);
127 updateSerialSlow(crc4, b, i, j);
128
129 check(crc1, crc2);
130 check(crc3, crc4);
131 check(crc1, crc3);
132
133 }
134 }
135
136 report("finished small survey adler32", crc1, crc2, crc3, crc4);
137 }
138 }
139
140
141 private static void report(String s, Checksum crc1, Checksum crc2,
142 Checksum crc3, Checksum crc4) {
143 System.out.println(s + ", crc1 = " + crc1.getValue() +
144 ", crc2 = " + crc2.getValue()+
145 ", crc3 = " + crc3.getValue()+
146 ", crc4 = " + crc4.getValue());
147 }
148
149 private static void check(Checksum crc1, Checksum crc2) throws Exception {
150 if (crc1.getValue() != crc2.getValue()) {
151 String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue();
152 System.err.println(s);
153 throw new Exception(s);
154 }
155 }
156
157 private static byte[] initializedBytes(int M) {
158 byte[] bytes = new byte[M];
159 for (int i = 0; i < bytes.length; i++) {
160 bytes[i] = (byte) i;
161 }
162 return bytes;
163 }
164
165 private static void updateSerial(Checksum crc, byte[] b, int start, int length) {
166 for (int i = 0; i < length; i++)
167 crc.update(b[i+start]);
168 }
169
170 private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) {
171 for (int i = 0; i < length; i++)
172 crc.update(b[i+start]);
173 crc.getValue();
174 }
175
176 private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) {
177 ByteBuffer buf = ByteBuffer.allocateDirect(length);
178 buf.put(b, start, length);
179 buf.flip();
180 crc3.update(buf);
181 }
182
183 private static void updateDirect(Adler32 crc3, byte[] b, int start, int length) {
184 ByteBuffer buf = ByteBuffer.allocateDirect(length);
185 buf.put(b, start, length);
186 buf.flip();
187 crc3.update(buf);
188 }
189
190 }